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      <title>对于springcloud了解多少 - 交互式测验</title>
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      <div class="main-wrapper">
          <div class="quiz-container">
            <div class="quiz-header">
              <h1>对于springcloud了解多少 - 交互式测验</h1>
              <p>检验你对文档内容的理解程度</p>
            </div>
            <div id="quiz-content">
                <div class="quiz-body">
                    <div class="progress-bar">
                        <div id="progress-indicator"></div>
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                    <div id="question-container">
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      <script>
        const quizData = [
  {
    "question": "根据文档，Spring Cloud Hystrix (或其替代品 Resilience4j) 在微服务架构中的核心作用是什么？",
    "options": [
      "实现服务实例的自动注册与发现，以便服务间可以相互调用。",
      "提供API网关功能，对外部请求进行路由、限流和安全验证。",
      "实现断路器模式，保护系统在某个服务出现故障时免受级联故障的影响。",
      "集中管理所有微服务的配置文件，并支持动态刷新。"
    ],
    "correctAnswerIndex": 2,
    "explanation": "文档中明确指出，Hystrix或Resilience4j用于实现断路器模式。当一个下游服务调用失败或响应缓慢时，断路器会“跳闸”，阻止后续请求，从而避免因单个服务的故障导致整个系统的资源耗尽和崩溃（即级联故障）。",
    "source": "文档中「1.2 Spring Cloud 的核心组件」部分的“断路器和熔断器”条目，以及「2.1 Spring Cloud Netflix」部分的“Hystrix”条目。",
    "hint": "思考一下，当一个服务依赖的另一个服务变得不可用时，系统如何进行自我保护以维持整体的稳定性？"
  },
  {
    "question": "关于Spring Cloud Gateway，以下哪项描述是正确的？",
    "options": [
      "它是Spring Cloud Netflix套件的一部分，与Eureka和Ribbon紧密集成。",
      "它是Spring Cloud提供的第一代API网关，现在已被Zuul 2所取代。",
      "它主要用于实现服务间的负载均衡，通过轮询等策略分发请求。",
      "它基于Spring 5的WebFlux构建，支持响应式编程模型，是替代Zuul的第二代网关。"
    ],
    "correctAnswerIndex": 3,
    "explanation": "文档明确说明，Spring Cloud Gateway是Spring Cloud提供的“第二代网关服务”，用于替代Zuul的部分功能。它的一个关键特性是基于Spring 5的WebFlux构建，这使其能够支持响应式编程，从而获得更好的性能和吞吐量。",
    "source": "文档中「2.2 Spring Cloud Gateway」部分。",
    "hint": "文档中提到了一个替代了Zuul的“第二代网关”，它的技术基础是什么？"
  },
  {
    "question": "Spring Cloud Config组件的主要设计目标是什么？",
    "options": [
      "使用Kubernetes的ConfigMap和Secrets来管理配置。",
      "为微服务提供统一的安全认证和授权机制。",
      "提供分布式追踪，帮助监控服务间的调用链路。",
      "实现配置的集中式管理，并支持配置的动态更新，避免服务重启。"
    ],
    "correctAnswerIndex": 3,
    "explanation": "Spring Cloud Config的核心功能是提供集中式的配置管理。它允许将所有微服务的配置文件存储在一个中心位置（如Git仓库），并且当配置变更时，可以通知客户端服务动态刷新配置，而无需重新启动服务。",
    "source": "文档中「2.3 Spring Cloud Config」部分。",
    "hint": "在拥有数十甚至数百个微服务的系统中，如何高效、统一地管理它们的配置信息？"
  },
  {
    "question": "根据文档中提到的设计原则，Spring Cloud在处理分布式系统的一致性、可用性和分区容错性（CAP理论）时，通常采用哪种模型？",
    "options": [
      "CP模型，优先保证数据的一致性和分区容错性，可能会牺牲可用性。",
      "CA模型，优先保证一致性和可用性，但这在分布式系统中几乎无法实现。",
      "AP模型，优先保证系统的可用性和分区容错性，同时通过其他机制尽力保证最终一致性。",
      "ACID模型，确保所有分布式事务都满足原子性、一致性、隔离性和持久性。"
    ],
    "correctAnswerIndex": 2,
    "explanation": "文档明确指出：“Spring Cloud 采用 CAP 原则中的 AP 模型，在保证系统可用性和分区容忍性的同时，通过幂等性设计和重试机制实现数据一致性。” 这意味着在网络分区发生时，系统会选择继续提供服务（可用性），而不是为了保证强一致性而拒绝服务。",
    "source": "文档中「3.4 一致性与容错性」部分。",
    "hint": "在分布式网络中，网络故障是不可避免的。在这种情况下，系统是选择继续响应用户，还是为了数据绝对正确而停止服务？"
  },
  {
    "question": "当在Kubernetes环境中部署Spring Cloud应用时，Spring Cloud Kubernetes项目提供了什么能力？",
    "options": [
      "它强制要求在Kubernetes集群中部署Eureka Server来进行服务发现。",
      "它将Kubernetes作为一个虚拟机平台，与底层特性完全解耦。",
      "它提供了一套全新的容器编排工具来取代Kubernetes。",
      "它能与Kubernetes的原生机制集成，例如使用K8s的服务发现和ConfigMap进行配置管理。"
    ],
    "correctAnswerIndex": 3,
    "explanation": "Spring Cloud Kubernetes旨在让Spring Cloud应用更好地融入Kubernetes生态。它通过集成Kubernetes的原生功能，例如利用Kubernetes自身的Service资源进行服务发现和负载均衡，以及使用ConfigMap和Secrets来管理配置，从而避免了在K8s中再部署一套功能重叠的组件（如Eureka）。",
    "source": "文档中「2.4 Spring Cloud Kubernetes」部分。",
    "hint": "考虑一下“云原生”的思想，框架应该如何适应其运行环境，而不是让环境来适应框架？"
  },
  {
    "question": "文档中提到的Spring Cloud Stream组件是用来解决什么问题的？",
    "options": [
      "实现客户端的负载均衡，将请求分发到多个服务实例。",
      "构建消息驱动的微服务，通过集成Kafka、RabbitMQ等消息中间件实现异步通信。",
      "对API请求进行路由和过滤。",
      "追踪和监控跨多个服务的请求链路。"
    ],
    "correctAnswerIndex": 1,
    "explanation": "根据文档描述，Spring Cloud Stream用于“集成消息中间件（如 Kafka、RabbitMQ），实现事件驱动架构”。这表明它的核心作用是简化构建基于消息的、事件驱动的微服务应用，实现服务间的解耦和异步通信。",
    "source": "文档中「1.2 Spring Cloud 的核心组件」部分的“消息驱动的微服务”条目。",
    "hint": "当服务之间不需要实时同步响应，而是通过事件或消息进行通信时，应该使用哪个组件？"
  },
  {
    "question": "尽管Spring Cloud功能强大，但文档也指出了它所面临的一项主要挑战。这项挑战是什么？",
    "options": [
      "缺乏广泛的社区支持和文档资源。",
      "只能与特定的云服务商（如Netflix）绑定，无法在其他环境部署。",
      "随着服务数量的增加，系统的整体复杂性管理和监控变得困难。",
      "性能极差，不适用于企业级或金融行业的应用。"
    ],
    "correctAnswerIndex": 2,
    "explanation": "文档在“5.2 挑战”部分明确列出了“复杂性管理”。原文指出：“随着服务数量的增加，系统的复杂性也随之增加，需要合适的管理和监控工具。” 这是微服务架构普遍面临的问题，Spring Cloud也不例外。",
    "source": "文档中「5.2 挑战」部分。",
    "hint": "将一个整体拆分成许多小部分后，管理这些小部分之间的关系会带来什么新的问题？"
  }
];
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            const totalQuestions = quizData.length;
            const answeredCount = userAnswers.filter(a => a !== null).length;
            const wrongCount = answeredCount - correctCount;
            const skippedCount = totalQuestions - answeredCount;
            const accuracy = totalQuestions > 0 ? Math.round((correctCount / totalQuestions) * 100) : 0;
            const errorRate = totalQuestions > 0 ? Math.round((wrongCount / totalQuestions) * 100) : 0;

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                '<h2>答题报告</h2>' +
                '<div class="score-summary">' +
                '<div class="score-card">' +
                '<h3>得分</h3>' +
                '<p>' + correctCount + ' / ' + totalQuestions + '</p>' +
                '</div>' +
                '<div class="score-card">' +
                '<h3>正确率</h3>' +
                '<p>' + accuracy + '%</p>' +
                '</div>' +
                '<div class="score-card">' +
                '<h3>错误率</h3>' +
                '<p>' + errorRate + '%</p>' +
                '</div>' +
                '<div class="score-card score-details">' +
                '<table>' +
                '<tr><td>正确</td><td>' + correctCount + '</td></tr>' +
                '<tr><td>错误</td><td>' + wrongCount + '</td></tr>' +
                '<tr><td>未答</td><td>' + skippedCount + '</td></tr>' +
                '</table>' +
                '</div>' +
                '</div>' +
                '<div class="report-actions">' +
                '<button id="review-btn">回顾测验</button>' +
                '<button class="primary" onclick="location.reload()">再试一次</button>' +
                '</div>' +
                '</div>';

            let reportEl = document.querySelector('.final-score-container');
            if (reportEl) {
                reportEl.remove();
            }
            quizContentEl.insertAdjacentHTML('beforeend', finalScoreHtml);
            document.getElementById('review-btn').addEventListener('click', reviewQuiz);
        }

        function reviewQuiz() {
            const reportEl = document.querySelector('.final-score-container');
            if (reportEl) {
                reportEl.remove();
            }

            document.querySelector('.quiz-body').style.display = 'block';
            document.getElementById('quiz-footer').style.display = 'flex';
            
            currentQuestionIndex = 0;
            loadQuestion();
            updateNavigationButtons(); // Ensure nav buttons are correctly displayed
        }

        // Event Delegation for options
        optionsListEl.addEventListener('click', (event) => {
            if (event.target && event.target.matches('li.option-item')) {
                // Check if the question has already been answered
                if (userAnswers[currentQuestionIndex] === null) {
                    const selectedIndex = parseInt(event.target.dataset.index, 10);
                    selectOption(selectedIndex);
                }
            }
        });

        prevBtn.addEventListener('click', goToPreviousQuestion);
        nextBtn.addEventListener('click', goToNextQuestion);
        hintBtn.addEventListener('click', showHint);
        
        // 初始加载
        loadQuestion();
      </script>
    </body>
    </html>
  